cmake: Handle conflict between generated .deb and Debian package

Update the generated .deb's metadata to enforce that it cannot be
installed alongside the version of libiio shipped in the Debian
repositories.

Fixes #923.

Signed-off-by: Paul Cercueil <paul@crapouillou.net>

cmake/LinuxPackaging.cmake

@@ -137,4 +137,14 @@ if(${CMAKE_MAJOR_VERSION} LESS 3)
 			OUTPUT_STRIP_TRAILING_WHITESPACE)
 	ENDIF(NOT CPACK_DEBIAN_PACKAGE_ARCHITECTURE)
 endif()
+
+# Make sure the generated .deb cannot be installed alongside the Debian ones
+set(CPACK_DEBIAN_PACKAGE_PROVIDES
+	"libiio0 (= ${LIBIIO_VERSION}), "
+	"libiio-dev (= ${LIBIIO_VERSION}), "
+	"libiio-utils (= ${LIBIIO_VERSION}), "
+	"iiod (= ${LIBIIO_VERSION})")
+set(CPACK_DEBIAN_PACKAGE_CONFLICTS "libiio0, libiio-dev, libiio-utils, iiod")
+set(CPACK_DEBIAN_PACKAGE_REPLACES "libiio0, libiio-dev, libiio-utils, iiod")
+
 include(CPack)